De 7 - Tinh Luong

package javaapplication;

import java.awt.*;
import java.awt.event.*;

public class De7 extends Frame implements ActionListener {

    Label lbFormTest, lbBasicSalary, lbRate, lbSalary;
    TextField tfBasicSalary, tfRate, tfSalary;
    Button btCalculate;
    GridBagLayout gb;
    GridBagConstraints gbc;

    public De7(String title) {
        super(title);

        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent we) {
                System.exit(0);
            }
        });

        lbFormTest = new Label("FormTest");
        lbBasicSalary = new Label("BasicSalary");
        lbRate = new Label("Rate");
        lbSalary = new Label("Salary");
        tfBasicSalary = new TextField(20);
        tfRate = new TextField(20);
        tfSalary = new TextField(20);
        btCalculate = new Button("Calculate");

        tfSalary.setEnabled(false);
        gb = new GridBagLayout();
        this.setLayout(gb);
        this.Them(lbFormTest, 1, 0, 1, 1);
        this.Them(lbBasicSalary, 0, 1, 1, 1);
        this.Them(lbRate, 0, 2, 1, 1);
        this.Them(lbSalary, 0, 3, 1, 1);
        this.Them(tfBasicSalary, 1, 1, 1, 1);
        this.Them(tfRate, 1, 2, 1, 1);
        this.Them(tfSalary, 1, 3, 1, 1);
        this.Them(btCalculate, 1, 4, 1, 1);
        btCalculate.addActionListener(this);
    }

    public void Them(Component comp, int x, int y, int rong, int cao) {
        gbc = new GridBagConstraints();
        gbc.gridx = x;
        gbc.gridy = y;
        gbc.gridwidth = rong;
        gbc.gridheight = cao;
        gb.setConstraints(comp, gbc);
        this.add(comp);
    }

    public static void main(String[] args) {
        De7 fr = new De7("Thieu Mao");
        fr.setSize(400, 300);
        fr.setVisible(true);
    }

    public void actionPerformed(ActionEvent a) {
        if(a.getSource()==btCalculate){
            if(tfBasicSalary.getText().isEmpty()){
                System.out.println("Loi");
            }else{
                if(tfRate.getText().isEmpty()){
                    try{
                        float bs = Float.valueOf(tfBasicSalary.getText());
                        float salary = (float) (bs*2.34);
                        tfSalary.setText(String.valueOf(salary));
                    }catch(Exception e){
                        System.out.println("Da Loi");
                    }
                }else{
                    try {
                    float bs = Float.valueOf(tfBasicSalary.getText());
                    float rate = Float.valueOf(tfRate.getText());
                    float salary = (float) (rate*bs);
                    tfSalary.setText(String.valueOf(salary));
                    } catch (Exception e) {
                        System.out.println("Da Loi Roi");
                    }
                }
            }

        }


    }


}